<template>
  <div class="about">
    <h1>This is an about page</h1>
    <button @click="print('abc')">print</button>
    <button @click="swap(['a',123])">print</button>
  </div>
</template>
<script setup lang="ts">
function print<T>(arg:T):T{
  console.log(arg)
  return arg;
}
function swap<T,U>(tuple:[T,U]):[U,T]{
  print(tuple)
  return [tuple[1],tuple[0]]
}
</script>
